Hierarchical Taxonomy -> display only first and second levels

Hi there,

I need to build a menu from an hierarchical vocabulary showing only the first and second levels terms (in total there are 3 levels).

How can accomplish it (even hacking the module's code)?

If the second level term has child terms, I'd like also to exbiht a list of terms ids into this term, meaning: the term id + all childs terms.

Example:
- Item A
- Item Aa
- Item Ab
- Item Aba
- Item Abb

The menu should list only Item A and as rollover the items Aa and Ab.
The item Ab should have the link "myView/idAba + idAbb"

How could this be possible? Any tip, clue or suggestion?

Thanks a lot,
Carlos
PS: i'm using also Nice Menu module for rollover the second level term.